Figure 1.

Relation between outcome, CPR quality and time to first defibrillation (≤ 10 minutes),
in patients presenting with VF/VT (a, upper); or asystole/PEA (b, lower). Note that the BLS phase may extend beyond the first defibrillation. CPR quality scale:
None; Intermediate quality; Compressions and ventilations of good quality. Individual
observations have been scattered and stacked to improve visualization.